For that indicator, FAO provides data for Poland from 1961 to 2017. The average value for Poland during that period was 2816 kg per hectar with a minimum of 1600 kg per hectar in 1962 and a maximum of 4268 kg per hectar in 2014.
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Definition: Cereal yield, measured as kilograms per hectare of harvested land, includes wheat, rice, maize, barley, oats, rye, millet, sorghum, buckwheat, and mixed grains. Production data on cereals relate to crops harvested for dry grain only. Cereal crops harvested for hay or harvested green for food, feed, or silage and those used for grazing are excluded. The FAO allocates production data to the calendar year in which the bulk of the harvest took place. Most of a crop harvested near the end of a year will be used in the following year.